Optical System With Dual-Function Elements for Peripheral Defocus
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Solution Overview
Problem
Conventional single vision optical lenses often lead to inaccurate focusing, particularly in children, causing progression of myopia or hyperopia due to peripheral images being focused behind the retina, which can worsen over time.
Innovation Solution
An optical system with an optical lens and device comprising multiple optical elements, each with two different optical functions, configured to minimize the difference in optical power between the system and the prescription, focusing central vision on the retina while peripheral vision is focused either in front or behind the retina to slow down abnormal refraction progression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single vision optical lenses are used to correct myopia or hyperopia, then the central vision can be corrected, but the peripheral images are focused behind the retina causing progression of abnormal refraction
Solution Approach 1:
The optical lens implements different optical functions in different zones: the central zone provides standard correction for clear central vision, while the peripheral zone introduces controlled defocus (either positive or negative) to address peripheral imaging errors. This local differentiation allows the lens to simultaneously optimize central acuity and peripheral focus, preventing the progression of myopia or hyperopia that occurs with conventional single-vision lenses.
2Reliability
If an optical device with multiple optical elements is added to provide different optical functions, then peripheral defocus can be controlled, but the device complexity increases
Solution Approach 1:
The patent combines multiple optical elements (refractive elements and diffractive elements) into a single integrated optical lens. The refractive portion provides the primary corrective power for the wearer's refractive error, while the diffractive portion introduces controlled defocus in the peripheral zones. By merging these functions into one lens rather than using separate devices, the system achieves complex optical functionality while maintaining practical wearability and simplicity.
Solution Approach 2:
The optical lens serves multiple functions simultaneously: it corrects the wearer's refractive error (myopia or hyperopia) for clear central vision, and it controls peripheral defocus to prevent progression of abnormal refraction. The lens also accommodates both refractive and diffractive optical mechanisms within a single element, making it a multi-functional optical device that addresses multiple vision problems at once.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces the progression of myopia or hyperopia by ensuring accurate central vision focus and managing peripheral defocus, enhancing overall visual acuity and comfort.
Implementation Method 1
an optical lens having at least a control point... each optical element has simultaneously two different optical functions... part of the light focused on the retina of the wearer for the central vision
Data Source
AI summary
An optical system intended to be worn in front of an eye of a wearer including an optical lens having at least a control point and an optical device that has a plurality of optical elements, the optical device being attached on a surface of the optical lens or encapsulated into the optical lens, wherein each optical element has simultaneously two different optical functions, and the optical device and the optical lens are configured so that the absolute value of the difference between a measured optical power at the control point of the optical system and the optical power corresponding to the prescription for said eye of the person is smaller than or equal to 0.12 diopter.